The sliding cabinet is a quite big and it was very hard to slide the doors. The biggest friction was in corners, which has to hold the whole weight of the doors.
I also designed better "wheeled" corners. Now the sliding is much more acceptable.
Brand of sliding doors is KOOPLAST, but maybe this solution can be used for other manufacturers.
Updates
9.2.2018
The author marked this model as their own original creation. Imported from Thingiverse.